CVE-2023-0855 : What You Need to Know

This CVE-2023-0855 relates to a buffer overflow vulnerability found in the IPP number-up attribute process of Canon Office/Small Office Multifunction Printers and Laser Printers. Exploiting this vulnerability could lead to the affected product becoming unresponsive or the execution of arbitrary code by an attacker on the network segment.

Understanding CVE-2023-0855

This section will provide a deeper insight into the nature of CVE-2023-0855 and its potential impact on affected systems.

What is CVE-2023-0855?

CVE-2023-0855 is a buffer overflow vulnerability identified in the IPP number-up attribute process of certain Canon printers. This flaw could be exploited by a malicious actor on the network to disrupt the normal functioning of the target devices or execute unauthorized code.

The Impact of CVE-2023-0855

The impact of this vulnerability is significant as it poses a high risk to the confidentiality, integrity, and availability of the affected Canon printers. With a CVSS base score of 9.8 (Critical), immediate action is required to prevent exploitation and mitigate potential damage.

Technical Details of CVE-2023-0855

In this section, we will delve into the specific technical aspects of CVE-2023-0855, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability identified in CVE-2023-0855 is categorized as a stack-based buffer overflow (CWE-121), allowing an attacker to overrun the buffer allocated to store data, potentially leading to the execution of malicious code or denial of service.

Affected Systems and Versions

Canon Office/Small Office Multifunction Printers and Laser Printers running specific firmware versions are affected by this vulnerability. The impacted products include Satera LBP660C Series, LBP620C Series, MF740C Series, MF640C Series, Color imageCLASS LBP660C Series, LBP 620C Series, X LBP1127C, MF740C Series, MF640C Series, X MF1127C, i-SENSYS LBP660C Series, LBP620C Series, MF740C Series, MF640C Series, C1127P, C1127iF, and C1127i firmware Ver.11.04 and earlier.

Exploitation Mechanism

The vulnerability can be exploited by an attacker located on the same network segment as the affected Canon printers. By sending specially crafted requests related to the IPP number-up attribute, an attacker can trigger the buffer overflow and potentially achieve remote code execution.

Mitigation and Prevention

To address CVE-2023-0855 and safeguard vulnerable systems, immediate steps should be taken to mitigate the risk and enforce long-term security practices. Patching and updates play a crucial role in remedying this critical vulnerability.

Immediate Steps to Take

Disable unnecessary network services on the affected Canon printers.
Apply patches or firmware updates provided by Canon to address the buffer overflow vulnerability.
Monitor network traffic for any suspicious activities targeting the IPP number-up attribute process.

Long-Term Security Practices

Implement network segmentation to restrict access and minimize the impact of potential attacks.
Conduct regular security audits and vulnerability assessments to detect and remediate weaknesses in printer security.
Educate users and IT personnel on best practices for maintaining a secure printing environment.

Patching and Updates

Canon has released firmware updates to patch the CVE-2023-0855 vulnerability in the affected printer models. It is essential to promptly apply these updates to mitigate the risk of exploitation and secure the devices against buffer overflow attacks.